[hackrmn]

I grew up learning programming on a genuine IBM PC running MS-DOS, neither of which was FOSS but taught me plenty that I routinely rely on today in one form or another.

[j45]

Very true.

Stories of exploring DOS often ended up at hex editing and assembly.

Best to learn with whatever options are accessible, plenty is transferable.

While there is an embarrassment of options to learn from or with today the greatest gaffe can be overlooking learning.